CN115882132A

CN115882132A - Battery cell, battery, electric device, manufacturing method, and manufacturing apparatus

Info

Publication number: CN115882132A
Application number: CN202111138956.4A
Authority: CN
Inventors: 邓高; 陈恒; 张小细; 朱建平
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2023-03-31

Abstract

The application provides a battery cell, a battery, an electric device, a manufacturing method and manufacturing equipment. The shell is provided with an opening and an accommodating cavity, the electrode assembly is arranged in the accommodating cavity and comprises a pole piece unit and a pole lug extending out of the pole piece unit. The top cover assembly covers the opening and comprises a cover body and a pole arranged on the cover body, slit holes communicated with the accommodating cavity are formed in the cover body, and the pole lugs penetrate through the slit holes to be electrically connected with the pole. The battery monomer that this application embodiment provided sets up utmost point ear and is connected with utmost point post is electrically conducted after passing the slit hole, avoids rolling over utmost point ear structure in the intracavity that holds of casing, has also avoided setting up the adaptor of utmost point ear and utmost point post in the intracavity that holds of casing, so can simplify the free structure of battery, save the inside space of the free casing of battery, improve the free volume energy density of battery. In addition, the battery monomer is difficult for taking place the deformation, has reduced utmost point ear and has inserted pole piece unit and utmost point ear torn risk.

Description

Battery cell, battery, electric device, manufacturing method, and manufacturing apparatus

Technical Field

The present disclosure relates to the field of battery technologies, and in particular, to a battery cell, a battery, an electric device, a manufacturing method, and a manufacturing apparatus.

Background

With the development of battery technology, electrical devices such as vehicles are getting closer to people's lives, and the performance requirements of batteries for supplying energy to the vehicles are getting higher.

In order to satisfy the corresponding functions of the battery under the premise of normal use, the structure of a battery monomer in the battery is generally complex and occupies more space.

Disclosure of Invention

The application provides a battery cell, a battery, an electric device, a manufacturing method and manufacturing equipment, which can simplify the structure of the battery cell and reduce the space occupied by the battery cell.

In one aspect, the present application provides a battery cell, including: a housing having an opening and an accommodation chamber; the electrode assembly is arranged in the accommodating cavity and comprises a pole piece unit and a pole lug extending out of the pole piece unit; and the top cover assembly covers the opening, and comprises a cover body and a polar pole arranged on the cover body, wherein the cover body is provided with a slit hole communicated with the accommodating cavity, and the polar pole penetrates through the slit hole to be electrically connected with the polar pole.

The battery monomer that this application embodiment provided sets up utmost point ear and passes the slit hole after and be connected with utmost point post is electrically conductive again, can directly stretch out utmost point ear from pole piece unit to the lid subassembly, avoids folding utmost point ear structure in the intracavity that holds of casing, has also avoided setting up the adaptor of utmost point ear and utmost point post in the intracavity that holds of casing, so can simplify the free structure of battery, save the inside space of the free casing of battery, improve the free volume energy density of battery. In addition, because the end part of the tab is led out of the accommodating cavity of the shell to the top cover assembly through the slit hole, when the single battery is subjected to loads such as vibration, impact and the like, the deformation is not easy to occur, and the risk that the tab is inserted into the pole piece unit and the tab is torn is reduced.

According to an embodiment of the application, the lid includes body and connector, is formed with open-top's storage tank on the body, and the slit hole passes the storage tank and holds the chamber intercommunication, and the connector sets up in the storage tank to sealed slit hole, and connect utmost point post and utmost point ear through the connector electricity.

So set up, can reduce utmost point ear and the extra space that the connector took too much top cap subassembly, can further improve the integrated level of top cap subassembly's structure, simplify top cap subassembly's structure, improve the free space utilization of battery simultaneously.

According to an embodiment of the application, the slot hole distributes along the week side of storage tank, and runs through the diapire setting of storage tank. The connection structure of the pole ear and the connector is further simplified. Thereby simplifying the overall construction of the top cap assembly.

According to an embodiment of this application, the connector includes along the range upon range of insulating base member, insulating lid and the electric conductor that sets up of top cap subassembly thickness direction, and the pole piece passes slit hole and is connected with the electric conductor, and utmost point ear and utmost point post are connected to the electric conductor, and electric conductor and utmost point ear clamp are located between insulating base member and the insulating lid, and insulating lid sets up in the electric conductor and keeps away from the one side that holds the chamber for sealed slit hole.

According to one embodiment of the present application, the electric conductor is a conductive sheet having a pole connecting portion and a tab connecting portion at both ends in a length direction of the battery cell, the pole connecting portion is connected to the pole, the tab connecting portion is connected to the tab, and the slit hole is provided at one side of the tab connecting portion. So set up, can further simplify the structure of connector to guarantee the free work safety of battery.

According to one embodiment of the application, the shape of the pole connecting part is matched with the shape of the bottom end of the pole, the shape of the pole lug connecting part is matched with the shape of the part, extending out of the slit hole, of the pole lug, and the shape of the conducting plate is matched with the shape of the accommodating groove. So set up the structure that can simplify the conducting strip, further simplify the overall structure of top cap subassembly, and improve the degree of agreeing with of conducting strip and storage tank, the installation of the electric conductor of can being convenient for more reduces the free installation degree of difficulty of battery.

According to one embodiment of the present application, the insulation cover body includes a first insulation cover body covering the slit hole and the tab connection portion, and a second insulation cover body covering a portion of the conductive sheet between the tab connection portion and the post connection portion. So can set up the shape and the size of insulating lid more in a flexible way, be convenient for insulating lid realizes simultaneously sealed and the insulation protection to utmost point ear and connection piece to the slit hole.

According to one embodiment of the present application, the material of the electrical conductor comprises copper; and/or, the material of the electrical conductor comprises aluminum; and/or the pole ear is connected with the conductor in a welding way; and/or the pole is connected with the conductor in a welding way.

Copper and aluminum also have better conductivity, and are easy to deform, so that the specific shape and size of the conductor can be conveniently set according to requirements. The pole and the pole lug are respectively welded and connected with the electric conductor, which is favorable for improving the connection strength.

On the other hand, the embodiment of the present application provides a battery, including the battery cell provided in any one of the above embodiments.

In another aspect, an embodiment of the present application provides an electric device, which includes the battery provided in the foregoing embodiment, and the battery is used for providing electric energy.

In another aspect, an embodiment of the present application provides a method for manufacturing a battery cell, including: providing an electrode assembly and a shell, wherein the shell is provided with an opening and an accommodating cavity, the electrode assembly is accommodated in the accommodating cavity, and the electrode assembly comprises a pole piece unit and a pole lug extending out of the pole piece unit; providing a top cover assembly, wherein the top cover assembly comprises a cover body and a pole arranged on the cover body, a slit hole communicated with the accommodating cavity is formed in the cover body, and the pole lug penetrates through the slit hole to be in conductive connection with the pole; the cap assembly and the housing are assembled to cover the opening with the cap assembly.

In another aspect, an embodiment of the present application provides a manufacturing apparatus of a battery cell, including: the electrode assembly comprises a pole piece unit and a pole ear extending out of the pole piece unit; the second providing module is used for providing a top cover assembly, the top cover assembly comprises a cover body and a pole arranged on the cover body, a slit hole communicated with the accommodating cavity is formed in the cover body, and the pole lug penetrates through the slit hole to be in conductive connection with the pole; and the assembly module is used for assembling the top cover assembly and the shell and covering the opening with the top cover assembly.

The embodiment of the application provides a battery monomer, a battery, power consumption device, manufacturing method and manufacturing equipment, set up utmost point ear and pass the slit hole after and be connected with utmost point post is electrically conductive again, can directly stretch out utmost point ear from the pole piece unit to the top cover subassembly, avoid folding utmost point ear structure in the intracavity that holds of casing, also avoided setting up the adaptor of utmost point ear and utmost point post in the intracavity that holds of casing, so can simplify the free structure of battery, save the inside space of the free casing of battery, improve the free volume energy density of battery. In addition, because the end part of the tab is led out of the accommodating cavity of the shell to the top cover assembly through the slit hole, when the single battery is subjected to loads such as vibration, impact and the like, the deformation is not easy to occur, and the risk that the tab is inserted into the pole piece unit and the tab is torn is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application;

FIG. 2 is an exploded view of a battery according to an embodiment of the present application;

fig. 3 is a partial structural view of a battery module according to an embodiment of the present application;

fig. 4 is an exploded view of a battery cell according to an embodiment of the present disclosure;

FIG. 5 is an enlarged view of a portion of FIG. 4 at C;

fig. 6 is a front view of a battery cell provided in an embodiment of the present application, with a housing omitted;

FIG. 7 is a schematic cross-sectional view taken along F-F of FIG. 6;

FIG. 8 is an enlarged view of a portion of FIG. 7 at D;

fig. 9 is a flowchart of a method for manufacturing a battery cell according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a manufacturing apparatus of a battery cell according to an embodiment of the present application.

In the drawings, the drawings are not necessarily drawn to scale.

Description of reference numerals:

1. a vehicle; 1a, a motor; 1b, a controller;

10. a battery; 11. a bottom case; 12. a top shell;

20. a battery module;

30. a battery cell;

40. a housing; 40a, an opening; 40b, an accommodating cavity;

50. an electrode assembly; 51. a pole piece unit; 52. a tab;

60. a cap assembly; 61. a cover body; 61a, slit holes; 611. a body; 611a, a receiving groove; 612. a linker; 6121. an insulating substrate; 6122. an insulating cover body; 6122', a first insulating cover; 6122", a second insulation cover; 6123. an electrical conductor; 6123', conducting strip; 62. a pole column;

100. a manufacturing apparatus; 110. a first providing module; 120. a second providing module; 130. assembling the modules;

x, thickness direction.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and therefore should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The directional terms used in the following description are intended to refer to directions shown in the drawings, and are not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in this application can be understood as appropriate by one of ordinary skill in the art.

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are not limited in the embodiment of the application.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive plate, a negative plate and an isolating membrane. The battery cell mainly depends on metal ions moving between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the current collector which is not coated with the positive active substance layer protrudes out of the current collector which is coated with the positive active substance layer, and the current collector which is not coated with the positive active substance layer is laminated to be used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the surface of negative pole mass flow body is scribbled to the negative pole active substance layer, and the mass flow body protrusion in the mass flow body of having scribbled the negative pole active substance layer of not scribbling the negative pole active substance layer is as negative pole utmost point ear after the mass flow body of not scribbling the negative pole active substance layer is range upon range of. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. The material of the diaphragm can be PP or PE, etc. In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge and discharge rate, and other performance parameters, and also needs to consider the safety of the battery.

Reference herein to emissions from the battery cell includes, but is not limited to: electrolyte, dissolved or split anode and cathode pole pieces, fragments of a separation film, high-temperature and high-pressure gas generated by reaction, flame and the like.

The inventor finds that the electric capacity of the battery can be gradually reduced along with the increase of the working time of the battery, and then disassembles the battery, disassembles the battery monomer in the battery, and analyzes and researches the structure and the service environment of the battery monomer. The inventors found that the tab of the battery cell internal electrode assembly had problems of insertion of the pole piece unit and tearing of the tab. Further research shows that the tab is usually bent and then arranged in a single battery shell, and the tab is subjected to repeated vibration, impact and other load actions along with the gradual lengthening of the service life of the battery, so that certain problems such as overturning and deformation can be caused. The problem that the pole lug is inserted into a winding core of the pole piece unit or the pole lug is torn is easily caused by the overturning and the deformation of the pole lug. In addition, the tab is folded to be arranged in the accommodating cavity inside the shell, so that the tab occupies too much space inside the shell of the battery monomer, and the increase of the volume energy density of the battery monomer is limited.

Based on the above problems discovered by the inventor, the inventor improves the structure of the battery cell, and the technical solution described in the embodiment of the present application is applicable to the battery cell, the battery including the battery cell, and the electric device using the battery.

The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, spacecraft, and the like; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above-mentioned electric devices.

For convenience of description, the following embodiment will be described by taking the electric device as the vehicle 1.

As shown in fig. 1, a battery 10 is provided inside a vehicle 1. The battery 10 may be disposed at the bottom or the head or the tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, and for example, the battery 10 may serve as an operation power source of the vehicle 1.

The vehicle 1 may further include a controller 1b and a motor 1a. The controller 1b is used to control the battery 10 to supply power to the motor 1a, for example, for operational power demand at the time of starting, navigation, and traveling of the vehicle 1.

In some embodiments of the present application, the battery 10 may be used not only as an operating power source of the vehicle 1, but also as a driving power source of the vehicle 1, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1.

Referring to fig. 2, the battery 10 includes a battery cell 30 (not shown in fig. 2). The battery 10 may further include a case for accommodating the battery cell 30.

The case is used for accommodating the battery cells 30, and the case may have various structural forms.

In some embodiments, the case may include a bottom shell 11 and a top shell 12. The bottom shell 11 and the top shell 12 are mutually covered. The bottom case 11 and the top case 12 together define a receiving space for receiving the battery cells 30. The bottom case 11 and the top case 12 may be both hollow structures having one side opened. The opening 40a of the bottom case 11 is closed to the opening side of the top case 12 to form a box body having an accommodating space. A sealing member may be disposed between the bottom shell 11 and the top shell 12 to achieve a sealed connection between the bottom shell 11 and the top shell 12.

In practical applications, the bottom shell 11 can be covered on the top of the top shell 12. The bottom case 11 may also be referred to as an upper case, and the top case 12 may also be referred to as a lower case.

The bottom case 11 and the top case 12 may be various shapes, for example, a cylinder, a rectangular parallelepiped, etc. In fig. 2, the bottom case 11 and the top case 12 are each exemplarily a rectangular parallelepiped structure.

In the battery 10, one or more battery cells 30 may be provided. If there are a plurality of battery cells 30, the plurality of battery cells 30 may be connected in series, in parallel, or in series-parallel. The series-parallel connection means that a plurality of battery cells 30 are connected in series or in parallel. The plurality of battery cells 30 may be directly connected in series or in parallel or in series-parallel, and then the whole body formed by the plurality of battery cells 30 is accommodated in the box body, or the plurality of battery cells 30 may be connected in series or in parallel or in series-parallel to form the battery module 20. The plurality of battery modules 20 are connected in series or in parallel or in series-parallel to form a whole, and are accommodated in the case.

In some embodiments, as shown in fig. 3, in the battery 10, the battery cell 30 is plural. The plurality of battery cells 30 are connected in series, in parallel, or in series-parallel to form the battery module 20. The plurality of battery modules 20 are connected in series or in parallel or in series-parallel to form a whole, and are accommodated in the case.

In some embodiments, the plurality of battery cells 30 in the battery module 20 may be electrically connected to each other through a bus member, so as to realize parallel connection, series connection or parallel connection of the plurality of battery cells 30 in the battery module 20.

According to the battery cell 30 provided in the embodiment of the present application, as shown in fig. 4, the battery cell 30 includes a case 40, an electrode assembly 50, and a cap assembly 60. The electrode assembly 50 is disposed in the case 40.

The housing 40 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like. The shape of the case 40 may be determined according to the specific shape of the electrode assembly 50. For example, if the electrode assembly 50 has a cylindrical structure, the case 40 may alternatively have a cylindrical structure. If the electrode assembly 50 has a rectangular parallelepiped structure, the case 40 may have a rectangular parallelepiped structure. In fig. 4, the case 40 and the electrode assembly 50 are each exemplarily of a rectangular parallelepiped structure.

The material of the housing 40 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present invention is not limited thereto.

The electrode assembly 50 accommodated in the accommodation chamber 40b of the case 40 may be one or more. In fig. 4, the electrode assembly 50 accommodated in the case 40 is one.

In some embodiments, the electrode assembly 50 further includes a positive electrode tab, a negative electrode tab, and a separator. The electrode assembly 50 may be a winding type structure formed of a positive electrode tab, a separator, and a negative electrode tab by winding. The electrode assembly 50 may also be a stacked structure formed of a positive electrode tab, a separator, and a negative electrode tab by a stacking arrangement.

The positive electrode sheet may include a positive electrode current collector and a positive electrode active material layer. The positive active material layer is coated on the surface of the positive current collector. The negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The isolating membrane is arranged between the positive plate and the negative plate and used for isolating the positive plate from the negative plate so as to reduce the risk of short circuit between the positive plate and the negative plate.

The material of the isolation film may be PP (polypropylene) or PE (polyethylene).

The tab 52 of the electrode assembly 50 is divided into a positive tab 52 and a negative tab 52. The positive electrode tab 52 may be a portion of the positive electrode collector that is not coated with the positive electrode active material layer. The negative electrode tab 52 may be a portion of the negative electrode collector that is not coated with the negative electrode active material layer.

In the embodiment, the cover body 61 of the top cap assembly 60 is adapted to cover the opening 40a of the case 40 to form a closed space for accommodating the electrode assembly 50, and the closed space can also be used for accommodating an electrolyte, such as an electrolyte. The terminal posts 62 of the end cap assembly are used as output components for outputting the electric energy of the battery cells 30, and one or two terminal posts 62 in the end cap assembly can be used.

The opening 40a of the housing 40 may be one or two. If the opening 40a of the housing 40 is one, the cap assembly 60 may be one. If the opening 40a of the housing 40 is two, the cap assembly 60 may be two. The two cover assemblies 60 cover the two openings 40a, respectively.

In some embodiments, there is one opening 40a of the housing 40 and one cap assembly 60. Two poles 62 may be disposed in the cap assembly 60. One of the poles 62 in the cap assembly 60 is electrically connected to one of the tabs 52 (positive electrode tabs) of the electrode assembly 50. The other terminal post 62 in the cap assembly 60 is electrically connected to the other tab 52 (negative tab) of the electrode assembly 50.

In other embodiments, there are two openings 40a of the housing 40. Two openings 40a are provided on opposite sides of the housing 40. The cap assembly 60 is two. The two cover assemblies 60 respectively cover the two openings 40a of the housing 40. In this case, the pole 62 in the cap assembly 60 may be one. The terminal post 62 of one of the cap assemblies 60 is electrically connected to one of the tabs 52 (positive tabs) of the electrode assembly 50; the pole 62 of the other cap assembly 60 is electrically connected to the other tab 52 (negative tab) of the electrode assembly 50.

In some embodiments, the battery cell 30 may also include a pressure relief mechanism (not shown). The pressure relief mechanism is mounted on the cap assembly 60. The pressure relief mechanism is used to relieve the pressure inside the battery cell 30 when the internal pressure or temperature of the battery cell 30 reaches a threshold value.

Illustratively, the pressure relief mechanism may be an explosion-proof valve, an explosion-proof sheet, a gas valve, a pressure relief valve, a safety valve, or the like.

In the embodiment of the present application, as shown in fig. 4 and 5, the battery cell 30 provided in the embodiment of the present application includes a case 40, an electrode assembly 50, and a cap assembly 60. The housing 40 has an opening 40a and a housing chamber 40b. An electrode assembly 50 is disposed in the receiving cavity 40b, the electrode assembly 50 including a pole piece unit 51 and a tab 52 protruding from the pole piece unit 51. The top cover assembly 60 covers the opening 40a, the top cover assembly 60 includes a cover body 61 and a pole 62 disposed on the cover body 61, a slit hole 61a communicating with the accommodating cavity 40b is formed on the cover body 61, and the pole 52 penetrates through the slit hole 61a to be electrically connected with the pole 62.

Specifically, the tab 52 may be directly connected to the post 62 through the slit hole 61a, or may be connected to the post 62 through an intermediate connector capable of conducting electricity. The slit hole 61a may be circular or square as long as it allows the tab 52 to pass therethrough.

It can be understood that, the tab 52 is arranged to pass through the slit hole 61a and then electrically connected to the pole 62, and the tab 52 can be directly extended out of the top cover assembly 60 from the pole piece unit 51, so as to avoid the structure of folding the tab 52 in the accommodating cavity 40b of the housing 40, and also avoid the adaptor of the tab 52 and the pole 62 arranged in the accommodating cavity 40b of the housing 40, so that the structure of the battery cell 30 can be simplified, the space inside the housing 40 of the battery cell 30 can be saved, and the volumetric energy density of the battery cell 30 can be improved. In addition, because the end of the tab 52 is led out from the accommodating cavity 40b of the housing 40 through the slit hole 61a to the top cover assembly 60, when the battery cell 30 is subjected to loads such as vibration and impact, the tab 52 is not easy to deform, the possibility that the tab 52 is inserted into the pole piece unit 51 is reduced, and the risk that the tab 52 is torn is also reduced.

The slit hole 61a may penetrate through the cap assembly 60 in the thickness direction X of the cap assembly 60, and after the tab 52 penetrates through the slit hole 61a and is connected to the post 62, the slit hole 61a is sealed, and the tab 52 is insulated to prevent leakage of the tab 52. The slit hole 61a may also penetrate through a portion of the top cap assembly 60 in the thickness direction X of the top cap assembly 60, that is, the slit hole 61a does not penetrate through the top cap assembly 60, at this time, the tab 52 is connected to the pole post 62 inside the top cap assembly 60, and the slit hole 61a is sealed by the cover body 61 of the top cap assembly 60 and insulated from the outside.

Therefore, the specific position of the slit hole 61a can be set according to the structure of the top cover assembly 60, and the related structure of the cover body 61 can be reasonably set according to the position of the slit hole 61a and the connection relationship with the cover body 61.

In some embodiments, the cover 61 includes a body 611 and a connector 612, wherein the body 611 has an open-top receiving groove 611a formed thereon, the slit hole 61a passes through the receiving groove 611a to communicate with the receiving cavity 40b, and the connector 612 is disposed in the receiving groove 611a to seal the slit hole 61a and electrically connect the pole 62 and the pole tab 52 through the connector 612.

Specifically, the shape of the receiving groove 611a is not limited, and optionally, the shape of the receiving groove 611a may be adapted to the shape of the connector 612, so that the tab 52 and the post 62 may be electrically connected by the connector 612, and the slit hole 61a may also be sealed by the connector 612.

The accommodating groove 611a with an open top is formed on the main body 611, and the tab 52 is connected with the connector 612 in the accommodating groove 611a, that is, the joint between the tab 52 and the terminal 62 is disposed inside the cover body 61, and it is not necessary to connect the tab 52 to the adaptor in the accommodating cavity 40a of the housing 40, and it is not necessary to dispose the tab 52 on the external hole member on the upper side of the top cap assembly 60, that is, at least part of the tab 52 and the connection part with the terminal 62 is disposed inside the cover body 61, so that the excessive extra space occupied by the tab 52 and the adaptor can be reduced, the structural integration of the top cap assembly 60 can be further improved, the structure of the top cap assembly 60 can be simplified, and the space utilization of the battery cell 30 can be improved.

It is understood that the connecting body 612 includes a connecting member having a conductive function to electrically connect the tab 52 and the post 62. In addition, the connector 612 may also include an insulator and a sealing member, the insulator is used to insulate the tab 52 from the pole piece unit 51 and other conductive structures such as external structures except the connector 612, and the sealing member is used to seal the slit hole 61a of the battery cell 30, so as to prevent water, oxygen and the like outside the battery cell 30 from entering the battery cell 30, and ensure the normal operation of the battery cell 30.

The specific arrangement position of the slit hole 61a is not limited, and the positional relationship between the slit hole 61a and the receiving groove 611a is also not limited, and it is necessary to reasonably set the lead-out position of the tab 52 according to the specific distribution position of the electrode assembly 50 and the tab 52 thereof, and to ensure that the tab 52 can be electrically connected to the connector 612 after passing through the slit hole 61a.

In some embodiments, the slit holes 61a are distributed along the circumference of the receiving groove 611a and are disposed through the bottom wall of the receiving groove 611 a.

That is, the slit hole 61a is provided near the side of the receiving groove 611a, and the tab 52 passes through the slit hole 61a and then passes through the shortest path to be connected to the connector 612, thereby further simplifying the connection structure between the tab 52 and the connector 612. Thereby simplifying the overall construction of the cap assembly 60.

The slit hole 61a is disposed on the peripheral side of the receiving groove 611a, and the slit hole 61a penetrates through the bottom wall of the receiving layer, that is, the slit communicates the receiving groove 611a and the receiving cavity 611a, so that the slit can be sealed by the connecting body 612 in the receiving groove 611a, so as to prevent external water, oxygen, and the like from entering the receiving cavity 611a of the battery cell 30 through the slit and further corroding the electrode assembly 50.

The connector 612 can be placed in the receiving groove 611a, so as to seal the slit hole 61a, and electrically connect the tab 52 and the terminal 62, and meanwhile, it is necessary to ensure that the tab 52 is insulated from the outside of the battery cell 30. The specific structure of the connecting body 612 is not limited, and it may be entirely wound or stacked.

In some embodiments, as shown in fig. 6-8, the connector 612 includes an insulating base 6121, an insulating cover 6122, and an electrical conductor 6123 stacked along the thickness direction X of the cap assembly 60. The tab 52 passes through the slit hole 61a and is connected to the conductor 6123, and the conductor 6123 connects the tab 52 to the pole 62. The conductor 6123 and the tab 52 are sandwiched between the insulating base 6121 and the insulating cover 6122. The insulating cover 6122 is disposed on a side of the conductive body 6123 away from the accommodating cavity 40b, and is used for sealing the slit hole 61a.

The tab 52 is bent after passing through the slit hole 61a and then connected to the conductor 6123, and the insulating substrate 6121 and the insulating cover 6122 are respectively located at two sides of the tab 52 and the conductor 6123, so as to prevent the tab 52 or the conductor 6123 from being electrically connected to other conductive parts of the cover 61 to cause short circuit. With this arrangement, the structure of the connecting body 612 can be further simplified, and the operational safety of the battery cell 30 can be ensured.

It can be understood that the tab 52 may be disposed on one side of the electrical conductor 6123 close to the insulating base 6121, or disposed on one side of the electrical conductor 6123 close to the insulating cover 6122, or a portion of the tab 52 is disposed on one side of the electrical conductor 6123 close to the insulating base 6121, and another portion of the tab is disposed on one side of the electrical conductor 6123 close to the insulating cover 6122, so that the tab 52 can be electrically connected to the pole 62 through the electrical conductor 6123.

It is understood that the conductor 6123 may be in a cylindrical shape or a sheet shape, and in the embodiment where the conductor is in a cylindrical shape, the pole piece may be wound around the axis of the conductor 6123 on the periphery of the conductor 6123.

In some embodiments, the electric conductor 6123 is a conductive sheet 6123', and both ends of the conductive sheet 6123' along the length direction of the battery cell 30 have a pole connection portion and a tab connection portion (not shown). The pole connecting portion is connected to the pole 62, the tab connecting portion is connected to the tab 52, and the slit hole 61a is provided on one side of the tab connecting portion.

Specifically, the length direction of the battery cell 30 is perpendicular to the thickness direction X of the cap assembly 60. After the tab 52 of the top cap assembly 60 passes through the slit hole 61a, it is folded in the direction of the conductive sheet 6123', and may contact with one side of the conductive sheet 6123' close to the insulating substrate 6121, or may contact with one side of the conductive sheet 6123' close to the insulating cover 6122. The tab connection portion of the conductive sheet 6123' is adapted to the folded shape of the tab 52. The slit holes 61a may be formed in a side of the tab connecting portion away from the post connecting portion, or may be formed in both sides of a connecting line between the tab connecting portion and the post connecting portion.

It can be understood that, by providing the conductive sheet 6123 as the conductive sheet 6123', the folded pole piece can be connected to the surface of the conductive sheet 6123', so that the size of the top cover assembly 60 in the thickness direction X can be further reduced. And the tab 52 is connected with the conductive sheet 6123' by folding after passing through the slit hole 61a, which is more convenient and faster. In addition, the conductor 6123 is a conductive sheet 6123', and the pole 62 can be directly connected with the conductive sheet 6123' without being arranged on the cover body 61 through an intermediate nested structure, so that the connection structure of the pole 62 is simplified, and the overall structure of the top cover assembly 60 is further simplified.

It can be understood that the positions of the tab connection portion and the pole connection portion are not limited, and need to be specifically set according to the position of the tab 52 and the position of the pole 62, and the degree of limitation of the position of the conductive sheet 6123' on the cover body 61 is also considered, and after the above factors are combined, a suitable structural style of the conductive sheet 6123' is set, so that the conductive function of the conductive sheet 6123' is realized, and the overall structure of the top cover assembly 60 is simplified as much as possible.

Illustratively, the tab connecting portions and the post connecting portions may be arranged in a straight line, or in an "L" shape, or in a broken line, or in other arrangement forms as needed.

It is understood that the shapes of the tab connection part and the pole connection part are not limited as long as the electrical connection of the tab 52 with the pole 62 through the conductive sheet 6123' can be achieved.

In some embodiments, the shape of the pole connecting portion is adapted to the shape of the bottom end of the pole 62, the shape of the pole connecting portion is adapted to the shape of the portion of the pole 52 extending out of the slit hole 61a, and the shape of the conductive sheet 6123' is adapted to the shape of the receiving groove 611 a.

Illustratively, the shape of the pole 62 is cylindrical, the shape of the pole connection portion of the conductive sheet 6123 'is circular, and the shape of the folded tab 52 is rectangular, the shape of the tab connection portion of the conductive sheet 6123' is rectangular. The conductive sheet 6123' thus formed has an overall shape of a circle, a rectangle, or an intermediate connection structure therebetween.

The structure of conducting strip 6123' can be simplified by such an arrangement, and the shape of accommodating groove 611a is matched with the shape of conducting strip 6123', so that the conducting strip 6123' and the conducting strip 6123' can be better matched, the overall structure of top cover assembly 60 is further simplified, the degree of engagement between conducting strip 6123' and accommodating groove 611a is improved, the installation of conductor 6123 can be more convenient, and the installation difficulty of battery cell 30 is reduced.

It can be understood that the insulating base 6121 may be configured to be matched with the size of the receiving groove 611a, and the insulating cover 6122 may be configured to be matched with the shape of the receiving groove 611a, so as to further simplify the structure of the top cover assembly 60.

The insulating cover 6122 needs to cover the tab connection portion of the conductor 6123 and also needs to cover the portion between the tab connection portion and the pole connection portion to prevent the tab 52 or the conductor 6123 from being connected with other conductors 6123 to cause short circuit. In addition, it is necessary to cover the slit holes 61a through which the tab 52 passes to seal the slit holes 61a to prevent external water, oxygen, etc. from entering the inside of the battery cell 30.

Therefore, the insulating cover 6122 may be integrally formed, and the tab 52, the post 62 and the conductive sheet 6123' are connected to each other, and then the insulating cover 6122 is covered therewith. In addition, the insulating cover 6122 may be provided in a plurality of portions as needed, and each portion may be molded and then covered at a corresponding position.

In some embodiments, the insulation cover 6122 includes a first insulation cover 6122' and a second insulation cover 6122". The first insulating cover 6122 'covers the slit hole 61a and the tab connection portion, and the second insulating cover 6122 ″ covers the portion of the conductive sheet 6123' between the tab connection portion and the tab connection portion.

The insulating cover 6122 includes a first insulating cover 6122' and a second insulating cover 6122 ″, which may be formed separately, that is, the shape and size of the first insulating cover 6122' are set according to the slit hole 61a and the overall shape and size of the tab connection portion, and the shape and size of the second insulating cover 6122 ″ are set according to the shape and size of the portion of the conductive sheet 6123' between the tab connection portion and the post connection portion. Therefore, the shape and size of the insulating cover 6122 can be set more flexibly, which is convenient for the insulating cover 6122 to simultaneously realize sealing of the slit hole 61a and insulation protection of the tab 52 and the connecting piece.

The specific material of the conductor 6123 is not limited as long as the conductive function can be achieved.

In some embodiments, the material of the electrical conductor 6123 includes copper. Copper has good conductivity, is easy to deform, and is convenient for setting the specific shape and size of the conductor 6123 according to requirements.

In other embodiments, the material of the electrical conductor 6123 comprises aluminum. Aluminum also has good conductivity, is easy to deform, and facilitates setting of the specific shape and size of the conductor 6123 as required.

It can be understood that the material of the conductive body 6123 may include both aluminum and copper, and in the embodiment where the conductive body 6123 is the conductive sheet 6123', the conductive sheet 6123' may be a copper-aluminum conductive sheet 6123', so that good conductive performance of the conductive sheet 6123' can be ensured, and connection with the tab 52 is facilitated, and meanwhile, the shape and size of the copper-aluminum conductive sheet 6123' are also conveniently set as required, so as to further simplify the overall structure of the top cover assembly 60.

The tab 52 and the conductor 6123 may be connected by pressing or other processes, and the connection is not limited herein, as long as the contact between the tab 52 and the conductor 6123 is realized to ensure the electrical conduction between the two.

In some embodiments, tab 52 is welded to electrical conductor 6123. It will be appreciated that the welded connection can improve the strength of the connection between the tab 52 and the conductor 6123.

Similarly, the connection between the post 62 and the conductor 6123 may be through a nested structure, or may be through other connection methods, as long as the contact between the post 62 and the conductor 6123 is realized, so as to ensure the electrical conduction between the two.

In some embodiments, the post 62 is welded to the electrical conductor 6123. The welding connection can also omit an intermediate nesting structure between the pole 62 and the conductor 6123 while ensuring the connection strength of the pole and the conductor, thereby simplifying the overall structure of the top cover assembly 60.

The embodiment of the present application further provides a battery 10, which includes the battery cell 30 provided in any one of the above embodiments.

The battery 10 provided in the embodiment of the present application has the same technical effect due to the adoption of the battery cell 30 provided in any one of the above embodiments, and details are not repeated.

The embodiment of the present application further provides an electric device, which includes the battery 10 provided in the above embodiment, and the battery 10 is used for providing electric energy.

The power consumption device provided by the embodiment of the present application has the same technical effect due to the use of the battery 10 provided by the embodiment of the present application, and details are not described herein again.

As shown in fig. 9, the embodiment of the present application further provides a method for manufacturing a battery cell 30, which includes:

providing an electrode assembly 50 and a shell 40, wherein the shell 40 is provided with an opening 40a and a containing cavity 40b, the electrode assembly 50 is contained in the containing cavity 40b, and the electrode assembly 50 comprises a pole piece unit 51 and a pole ear 52 extending out of the pole piece unit 51;

a top cover assembly 60 is provided, the top cover assembly 60 includes a cover body 61 and a pole 62 disposed on the cover body 61, a slit hole 61a communicating with the accommodating cavity 40b is opened on the cover body 61, and the pole 52 penetrates through the slit hole 61a and is electrically connected with the pole 62. The cap assembly 60 and the housing 40 are assembled such that the cap assembly 60 covers the opening 40a.

The battery cell 30 manufactured by the manufacturing method of the battery cell 30 provided by the embodiment of the application extends the tab 52 from the pole piece unit 51 to the top cover assembly 60, so that the tab 52 structure is prevented from being folded in the accommodating cavity 40b of the housing 40, and the adaptor of the tab 52 and the pole 62 is also prevented from being arranged in the accommodating cavity 40b of the housing 40, thereby simplifying the structure of the battery cell 30, saving the space inside the housing 40 of the battery cell 30 and improving the volumetric energy density of the battery cell 30. In addition, since the end of the tab 52 is led out from the housing cavity 40b of the case 40 through the slit hole 61a to the top cover assembly 60, the battery cell 30 is not easily deformed when subjected to loads such as vibration and impact, and the risk of the tab 52 being inserted into the pole piece unit 51 and the tab 52 being torn is reduced.

The method of manufacturing the battery cell 30 of the embodiment of the present application can manufacture the battery cell 30 of the embodiment described above.

As shown in fig. 10, the present embodiment also provides a manufacturing apparatus 100 of a battery cell 30, which includes:

a first providing module 110 for providing an electrode assembly 50 and a case 40, the case 40 having an opening 40a and a receiving cavity 40b, the electrode assembly 50 being received in the receiving cavity 40b, the electrode assembly 50 including a pole piece unit 51 and a tab 52 extending out of the pole piece unit 51;

the second providing module 120 is configured to provide a top cover assembly 60, the top cover assembly 60 includes a cover body 61 and a pole 62 disposed on the cover body 61, a slit hole 61a communicating with the accommodating cavity 40b is formed in the cover body 61, and the pole 52 penetrates through the slit hole 61a and is electrically connected with the pole 62;

and an assembling module 130 for assembling the cap assembly 60 and the housing 40 to cover the opening 40a with the cap assembly 60.

The battery cell 30 that the manufacture equipment 100 of the battery cell 30 of the embodiment of this application made, stretch out utmost point ear 52 from pole piece unit 51 to cover subassembly 60, avoid folding pole ear 52 structure in the chamber 40b that holds of casing 40, also avoided setting up the adaptor of utmost point ear 52 and utmost point post 62 in the chamber 40b that holds of casing 40, so can simplify the structure of battery cell 30, save the inside space of casing 40 of battery cell 30, improve the volumetric energy density of battery cell 30. In addition, since the end of the tab 52 is led out from the accommodating cavity 40b of the housing 40 through the slit hole 61a to the top cover assembly 60, when the battery cell 30 is subjected to a load such as vibration or impact, deformation is not likely to occur, so that the possibility that the tab 52 is inserted into the pole piece unit 51 is reduced, and the risk that the tab 52 is torn is also reduced.

The manufacturing apparatus 100 of the battery cell 30 of the embodiment of the present application may perform the manufacturing method of the battery cell 30 of the embodiment described above.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. A battery cell, comprising:

a housing having an opening and an accommodation chamber;

the electrode assembly is arranged in the accommodating cavity and comprises a pole piece unit and a pole lug extending out of the pole piece unit;

the top cap subassembly, cover in the opening, the top cap subassembly include the lid and set up in the utmost point post of lid, set up on the lid with hold the slit hole of chamber intercommunication, utmost point ear passes the slit hole with utmost point post electrically conductive connection.

2. The battery cell as claimed in claim 1, wherein the cover body includes a body and a connector, the body has a receiving groove with an open top, the slit hole passes through the receiving groove and communicates with the receiving cavity, and the connector is disposed in the receiving groove to seal the slit hole and electrically connect the terminal post and the terminal tab via the connector.

3. The battery cell according to claim 2, wherein the slit holes are distributed along a peripheral side of the receiving groove and are disposed through a bottom wall of the receiving groove.

4. The battery cell as recited in claim 2, wherein the connector includes an insulating base, an insulating cover, and a conductor stacked in the thickness direction of the cap assembly, the pole piece passes through the slit hole and is connected to the conductor, the conductor connects the tab to the post, the conductor and the tab are sandwiched between the insulating base and the insulating cover, and the insulating cover is disposed on a side of the conductor away from the receiving cavity and is used for sealing the slit hole.

5. The battery cell according to claim 4, wherein the electric conductor is a conductive sheet, the conductive sheet has a terminal connecting portion and a tab connecting portion at both ends in a length direction of the battery cell, the terminal connecting portion is connected to the terminal, the tab connecting portion is connected to the tab, and the slit hole is provided at one side of the tab connecting portion.

6. The battery cell as claimed in claim 5, wherein the shape of the pole connecting portion is adapted to the shape of the bottom end of the pole, the shape of the pole tab connecting portion is adapted to the shape of the pole tab extending out of the slit hole portion, and the shape of the conductive sheet is adapted to the shape of the accommodating groove.

7. The battery cell according to claim 5, wherein the insulating cover includes a first insulating cover and a second insulating cover, the first insulating cover covers the slit hole and the tab connection portion, and the second insulating cover covers a portion of the conductive sheet between the tab connection portion and the post connection portion.

8. The battery cell according to any one of claims 4 to 7, wherein the material of the electrical conductor comprises copper; and/or the material of the electric conductor comprises aluminum; and/or the lug is connected with the conductor in a welding way; and/or the pole is connected with the conductor in a welding way.

9. A battery comprising the battery cell of any one of claims 1 to 8.

10. An electrical device comprising a battery according to claim 9 for providing electrical energy.

11. A method of manufacturing a battery cell, comprising:

providing an electrode assembly and a shell, wherein the shell is provided with an opening and a containing cavity, the electrode assembly is contained in the containing cavity, and the electrode assembly comprises a pole piece unit and a pole lug extending out of the pole piece unit;

providing a top cover assembly, wherein the top cover assembly comprises a cover body and a pole arranged on the cover body, a slit hole communicated with the accommodating cavity is formed in the cover body, and the pole lug penetrates through the slit hole to be in conductive connection with the pole;

assembling the cap assembly and the housing to cover the opening with the cap assembly.

12. An apparatus for manufacturing a battery cell, comprising:

the electrode assembly comprises a pole piece unit and a pole ear extending out of the pole piece unit, wherein the pole piece unit is provided with a first providing module and a shell, the shell is provided with an opening and a containing cavity, and the electrode assembly is contained in the containing cavity;

the second providing module is used for providing a top cover assembly, the top cover assembly comprises a cover body and a pole arranged on the cover body, a slit hole communicated with the accommodating cavity is formed in the cover body, and the pole lug penetrates through the slit hole to be in conductive connection with the pole;

and the assembling module is used for assembling the top cover assembly and the shell and covering the opening with the top cover assembly.